In the block to polyspermy, entry of the sperm's contents causes calcium ion levels in the oocyte's cytoplasm to rise, triggering the cortical reaction.
In biology, polyspermy describes the fertilization of an egg by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent.
The cell resulting from polyspermy, on the other hand, contains three or more copies of each chromosome—one from the egg and one each from multiple sperm. Usually, the result is an unviable zygote. This may occur because sperm are too efficient at reaching and fertilizing eggs due to the selective pressures of sperm competition.
The cortical reaction is a calcium-dependent exocytotic process in which the content of secretory granules is released into the perivitellin space immediately after fertilization, which serves to prevent polyspermic fertilization.
Learn more about polyspermy here : brainly.com/question/4537960
#SPJ4
The answer is 2,3,1. First the information is gathered then it is processed and carried to the glands or muscles
Answer:
The correct answer is B: it contains cellulose.
Explanation:
Looking at all of the options for this answer, we know that <u>both plant and animal cells contain a, c, and d</u> (a selectively permeable membrane). That leaves us with b: cellulose. <u>Cellulose is found ONLY in plants,</u> and it is what gives them their structure. That is what is different from the onion (the plant cell) and the human skin (the animal cell). Let me know if this helps!
**I know this is right b/c I just did this question on Edgenuity**
An original accretion of the earth
